How Much of O₂ from Water Flowing Over Gills Is

question 2

Multiple Choice

How much of O₂ from water flowing over gills is extracted by countercurrent exchange?

• A) 50% to 60%
• B) 60% to 70%
• C) 80% to 90%
• D) 90% to 100%

---

Definitions:

Expenses

Costs incurred in the process of earning revenue, which are subtracted from revenues to calculate net income.

Financial Statements

Formal records of the financial activities and position of a business, person, or other entity.

Balance Sheet

A financial statement that provides a snapshot of a company’s financial position, showing assets, liabilities, and shareholders' equity at a specific point in time.

Income Statement

A financial statement that shows a company's revenues and expenses over a specific period, indicating the net profit or loss.